Philippine troops clashed briefly with pro-IS militants in the volatile south on Saturday, the army said, in their first engagement since the government retook Marawi city in the country's biggest battle since World War Two. Photo -AP/PTI file for illustrative purpose

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Philippine troops clashed briefly with pro-IS militants in the volatile south on Saturday, the army said, in their first engagement since the government retook Marawi city in the country's biggest battle since World War Two. Photo -AP/PTI file for illustrative purpose

Manila: Philippine troops clashed briefly with pro-IS militants in the volatile south on Saturday, the army said, in their first engagement since the government retook Marawi city in the country's biggest battle since World War Two.

Army spokesman Major Ronald Suscano said six soldiers were wounded in the encounter. The clash erupted after government forces encountered about 10 members of the Maute group in a district in Lanao del Sur, a stronghold of the rebel group, which has pledged allegiance to IS, Suscano said in a statement.

The military in October declared victory over the Maute group, which seized control in the southern city of Marawi on May 23, after killing the remaining militants, including a few foreign fighters. More than 1,100 people, including 165 soldiers, died in the five-month conflict.

The siege of Marawi, the country's biggest security crisis in years, has stoked wider concerns that IS loyalists have learned how to thrive in impoverished Muslim areas of the island of Mindanao and use its jungles and mountains as staging posts to launch attacks.

Philippine President Rodrigo Duterte has extended martial law for all of this year in Mindanao, an island he called a "flashpoint for trouble" and atrocities by militantst and communist rebels.